java中保留小数点后几位的几种方法（以保留后两位为例）返回double型的返回String型的
返回double型的Java中的Math.round()函数double d = 114.145;d = (double) Math.round(d * 100) / 100;System.out.println(d);BigDecimal.ROUND_HALF_UP表示四舍五入BigDecimal.ROUND_HALF_DOWN是五舍六入BigDecimal.ROUND_U...
